CN210687002U - Radial Combined Sealing Structure of Axial Flow Control Valve - Google Patents

Abstract

The utility model discloses a radial combined sealing structure of an axial-flow type regulating valve, which comprises a valve cage arranged in a valve body of the axial-flow type regulating valve, wherein a valve core is coaxially arranged in the valve cage, and an annular accommodating groove is arranged at the joint of the valve cage and a valve seat at the position of mutual cooperation and around the inner wall; the notch limiting part of the annular accommodating groove comprises a protrusion I arranged on the valve cage and a protrusion II arranged on the valve seat, an annular sealing ring is arranged in the annular accommodating groove in a surrounding mode, an elastic O-shaped ring is sleeved on the outer ring surface of the annular sealing ring, and the inner ring surface of the annular sealing ring is exposed out of the notch of the annular accommodating groove and matched with and props against the circumferential surface of the valve core; and a plurality of through holes which can communicate the external space with the internal space of the cage are distributed on the surface of the cage. The utility model can avoid the erosion of the flowing medium to the inside of the sealing structure, and greatly prolongs the service life of the sealing structure; after the valve is closed, fluid can be prevented from flowing from a high-pressure side to a low-pressure side along an annular gap between the valve cage and the valve core, and the sealing effect is good.

Description

Radial Combined Sealing Structure of Axial Flow Control Valve

technical field

The utility model relates to a sealing structure, in particular to a radial combined sealing structure of an axial flow regulating valve, which is applied to the manufacture of pipeline valves.

Background technique

Axial flow pressure reducing valves are widely used in regulating and conveying pipelines due to their advantages of strong flow capacity, high dynamic stability, smooth operation and low noise. Through the product development and market research of the oil transfer valve, it is found that the axial flow valve often uses a soft sealing structure, but the medium scours the sealing ring seriously, which affects the sealing effect and reduces the sealing life. Although the patent application number is DE3731349A1 A trapezoidal annular sealing ring with better effect is disclosed, which has the defect of "low sealing performance" in actual operation. The reason is because the flow medium erodes the sealing ring seriously, which reduces the service life of the sealing ring on the one hand, and cannot guarantee effective sealing on the other hand. However, under severe working conditions, it is not only necessary to have a good sealing effect, but also to ensure a long service life and effectively protect the sealing ring.

SUMMARY OF THE INVENTION

Aiming at the problems of the above-mentioned prior art, the purpose of the present invention is to provide a radial combined sealing structure of an axial flow regulating valve, which is simple in structure, can avoid erosion of the flowing medium, has good sealing effect and has a long sealing service life.

In order to achieve the above purpose, the technical scheme adopted by the present invention is: a radial combined sealing structure of an axial flow regulating valve, comprising a valve cage arranged in the valve body of the axial flow regulating valve, the A valve core is coaxially arranged, the end of the valve cage is fitted and fixed on the valve seat of the axial flow regulating valve, and the valve cage and the valve seat are provided with an annular accommodating groove around the inner wall at the joint of each other; the ring The notch of the placement groove is provided with a limit part, and the limit part includes a protrusion I arranged on the valve cage and a protrusion II arranged on the valve seat. The axial directions of the cages extend toward each other, an annular sealing ring is arranged around the annular receiving groove, and an elastic O-ring is sleeved on the outer ring surface of the annular sealing ring, and the inner annular surface of the annular sealing ring is exposed to the annular receiving ring. The notch of the groove is matched against the circumferential surface of the valve core; the cage surface is distributed along its own axis with a plurality of through holes which can connect the outer space and the inner space of the cage.

Preferably, the inclination angle of the outer annular surface of the annular sealing ring is consistent with the inclination angle of the groove bottom surface of the annular accommodating groove. Due to the same degree of inclination, the pressure change of the flowing medium can be quickly transmitted to the elastic O-ring through the outer ring surface of the annular sealing ring, thereby effectively improving the response speed and the degree of deformation of the elastic O-ring in radial expansion and retraction. Thereby avoiding erosion and ensuring the effectiveness of the seal.

Preferably, the inner annular surface of the annular sealing ring is an inclined surface with an included angle of 45° with the axis of the valve core, and the inner annular surface is fitted on the surface of the protrusion I located on the inner side of the groove of the annular receiving groove. superior. The inclined surfaces designed to fit each other are beneficial to ensure a good sealing effect, and when the elastic O-ring expands and retracts in the radial direction, the inner ring surface of the annular seal ring can smoothly locate in the annular groove along the protrusion I. The surface sliding on one side of the groove realizes the corresponding sealing and anti-erosion functions.

Preferably, transition fillets are provided at the transition between the inner annular surface and the vertical direction. When the valve is closed, the transition fillet can increase the contact area between the part of the inner ring surface that exposes the annular accommodating notch and the outer surface of the valve core, further improving the sealing effect; and can avoid excessive movement of the valve core when the valve is opened. The inner ring of the cut ring seal faces it causing damage.

Preferably, the Shore hardness of the elastic O-ring can reach 90. Higher hardness increases rigidity and prolongs service life.

When the valve is closed, the inner ring surface of the annular sealing ring exposes the part of the notch of the annular housing groove, which wraps and clamps the outer surface of the valve core from the circumferential direction, so as to seal the gap between the cage and the outer surface of the valve core. , Because the annular sealing ring can be close to the valve core, the sealing effect is good, and it can prevent the fluid from flowing from the high pressure side to the low pressure side along the annular gap between the cage and the valve core, so as to realize the effective sealing of the valve; after the valve is opened, the valve The through hole of the cage can not only limit the flow, but also reduce the pressure of the fluid on the sealing structure, so that the compression force of the elastic O-ring is reduced, the whole is retracted along its own radial direction, and the annular seal is squeezed from the outside. The outer ring surface of the ring increases the volume of the part of the ring seal that is exposed to the notch of the annular housing groove and blocks the notch, so as to prevent the flowing medium from entering the annular housing groove from the notch and scouring the ring seal ring and the elastic O-ring. service life.

The utility model has a simple structure and is easy to implement and manufacture. After the valve is opened, the erosion of the inside of the sealing structure by the flowing medium can be avoided, thereby greatly prolonging the service life of the sealing. After the valve is closed, the fluid can be prevented from flowing between the valve cage and the valve core. The annular gap flows from the high pressure side to the low pressure side, the sealing effect is better, and "zero leakage" is achieved.

Description of drawings

Fig. 1 is the sealing structure schematic diagram of the present utility model when the valve is closed;

Fig. 2 is the enlarged view of A place in Fig. 1;

Fig. 3 is the exploded decomposition schematic diagram of Fig. 2;

Fig. 4 is the structural representation of the present utility model when the valve is closed;

Fig. 5 is the enlarged view of B place in Fig. 4;

In the figure, 11. Valve body, 12. Valve cage, 12-1. Protrusion I, 12-1-1. Surface, 12-2. Through hole, 13. Valve core, 14. Valve seat, 14-1. Protrusion II, 20. Annular receiving groove, 20-1. Bottom surface of groove, 21. Annular sealing ring, 21-1. Inner annular surface, 21-1-1. Transition fillet, 21-2. Outer annular surface, 22. Elastic O-ring, 30. High pressure side, 40. Low pressure side, 50. Clearance.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in the figure, a radial combined sealing structure of an axial flow regulating valve includes a valve cage 12 arranged in the valve body 11 of the axial flow regulating valve, and a valve core is arranged in the valve cage 12 coaxially with the valve cage 12 13. The end of the cage 12 is fitted and fixed on the valve seat 14 of the axial flow regulating valve, and the cage 12 and the valve seat 14 are provided with an annular accommodating groove 20 around the inner wall at the joint of each other; the ring The notch of the accommodating groove 20 is provided with a limiting part, and the limiting part includes a protrusion I12-1 provided on the valve cage 12 and a protrusion II14-1 provided on the valve seat 14, the protrusion I12-1 and the protrusion I12-1. II14-1 are oppositely arranged at the notch and extend to each other along the axial direction of the cage 12. An annular sealing ring 21 is arranged around the annular receiving groove 20, and an outer ring surface 21-2 of the annular sealing ring 21 is sleeved with a The elastic O-ring 22, the inner ring surface 21-1 of the annular sealing ring 21 exposes the notch of the annular receiving groove 20 and is matched against the circumferential surface of the valve core 13; the surface of the cage 12 is along its own axial direction There are a plurality of through holes 12-2 which can connect the outer space and the inner space of the cage.

Preferably, the inclination angle of the outer annular surface 21 - 2 of the annular sealing ring 21 and the groove bottom surface 20 - 1 of the annular accommodating groove 20 is consistent. Due to the consistent inclination, the pressure change of the flowing medium can be quickly transmitted to the elastic O-ring 22 through the outer ring surface 21-2 of the annular sealing ring 21, thereby effectively improving the response of the elastic O-ring 22 to radial expansion and retraction deformation speed and degree of deformation, thereby avoiding erosion and ensuring the effectiveness of the seal.

Preferably, the inner annular surface 21-1 of the annular sealing ring 21 is an inclined surface with an included angle of 45° with the axis of the valve core 13, and the inner annular surface 21-1 is fitted on the protrusion I12-1 located in the ring. It is placed on the surface 12-1-1 of the inner side of the groove 20. The inclined surfaces designed to fit each other are beneficial to ensure a good sealing effect, and when the elastic O-ring 22 expands and retracts in the radial direction, the inner ring surface 21-1 of the annular sealing ring 21 can smoothly follow the protrusion I12. -1 The surface 12-1-1 located on the inner side of the groove of the annular containing groove 20 slides to achieve the corresponding sealing and anti-erosion functions.

Preferably, a transition fillet 21-1-1 is provided at the transition between the inner annular surface 21-1 and the vertical direction. When the valve is closed, the transition fillet 21-1-1 can increase the contact area between the part of the inner annular surface 21-1 exposed from the notch of the annular receiving groove 20 and the outer surface of the valve core 13, which further improves the sealing effect; When opening, the movement of the valve core 13 can prevent the inner ring surface 21 - 1 of the annular sealing ring 21 from being damaged due to excessive shearing.

Preferably, the Shore hardness of the elastic O-ring 22 can reach 90. Higher hardness increases rigidity and prolongs service life.

The annular sealing ring 21 and the elastic O-ring 22 of the present invention are embedded in the annular receiving groove 20 in a pre-compressed manner. When the valve is closed, the flow medium in the high-pressure side 30 outside the cage 12 will flow into the cage 12 through the through hole 12-2 and fill the gap 50 between the inner wall of the cage 12 and the valve core 13. Under the action of the medium high pressure, the elastic O-ring 22 has a tendency to expand outward along the radial direction. At this time, the part of the inner ring surface 21-1 of the annular sealing ring 21 exposed to the notch of the annular receiving groove 20 is wrapped from the circumferential direction and formed. The outer surface of the valve core 13 is clamped together to seal the gap 50 between the notch and the outer surface of the valve core 13 . Since the annular sealing ring 21 can closely adhere to the valve core 13 , the sealing effect is good. When the valve needs to be opened, the valve core 13 moves in the axial direction. At this time, the valve core 13 is not in contact with the inner ring surface 21-1 of the annular sealing ring 21, and the medium on the high pressure side 30 will pass through the through hole 12-1 of the valve cage 12. 2 and flow into the low pressure side 40, at this time, the pressure of the flowing medium is reduced, the extrusion force of the elastic O-ring 22 is reduced, the elastic O-ring 22 shrinks along its radial direction as a whole, and squeezes the annular sealing ring from the outside The outer ring surface 21-2 of 21 increases the volume of the part of the annular sealing ring 21 exposed to the notch of the annular receiving groove 20 and blocks the notch, so as to prevent the flowing medium from entering the annular receiving groove 20 from the notch and scouring the annular sealing ring 21 and the groove. The elastic O-ring 22 prolongs the service life.

Claims (5)

1. A radial combined sealing structure of an axial flow regulating valve, characterized in that it comprises a valve cage (12) arranged in a valve body (11) of an axial flow regulating valve, and inside the valve cage (12) A valve core (13) is arranged coaxially with the valve core (13), the end of the valve cage (12) is fixed on the valve seat (14) of the axial flow regulating valve, and the valve cage (12) and the valve seat (14) are in the same position as the valve seat (14). A ring-shaped accommodating groove (20) is provided around the inner wall at the joints that cooperate with each other; the notch of the annular accommodating groove (20) is provided with a limit portion, and the limit portion includes a protrusion I ( 12-1) and the protrusion II (14-1) provided on the valve seat (14), the protrusion I (12-1) and the protrusion II (14-1) are oppositely located in the notch and along the valve cage (12-1). 12) axially extending toward each other, an annular sealing ring (21) is arranged around the annular accommodating groove (20), and an elastic O-shaped ring is sleeved on the outer ring surface (21-2) of the annular sealing ring (21). ring (22), the inner ring surface (21-1) of the annular sealing ring (21) exposes the notch of the annular accommodating groove (20) and fits against the circumferential surface of the valve core (13); the valve The surface of the cage (12) is distributed along its axial direction with a plurality of through holes (12-2) which can connect the outer space and the inner space of the cage. 2 . The radial combined sealing structure of the axial-flow regulating valve according to claim 1 , wherein the outer annular surface ( 21 - 2 ) of the annular sealing ring ( 21 ) and the annular accommodating groove ( 20 ) The inclination angle of the groove bottom surface (20-1) is the same. 3. The radial combined sealing structure of an axial flow regulating valve according to claim 1 or 2, characterized in that, the inner annular surface (21-1) of the annular sealing ring (21) is formed with the valve core (13). ) an inclined surface with an included angle of the axis of 45°, the inner annular surface (21-1) is fitted and fitted on the surface (12-1) of the protrusion I (12-1) located on the inner side of the groove of the annular receiving groove (20). -1-1) on. 4. The radial combined sealing structure of an axial flow regulating valve according to claim 1 or 2, characterized in that, a transition fillet (21) is provided at the transition between the inner annular surface (21-1) and the vertical direction -1-1). 5 . The radial combined sealing structure of the axial flow regulating valve according to claim 1 or 2 , wherein the Shore hardness of the elastic O-ring ( 22 ) is 90. 6 .

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